In a parallel Japan, labyrinths suddenly emerged, and monsters began to pour out. These labyrinths, initially perceived as nothing more than a new disaster, dramatically transformed into a stage for striking it rich, thanks to the valuable resources they generated and the "cards" dropped by monsters.

Monster cards capable of freely summoning monsters; adventurers who conquer labyrinths using the power of cards; Dungeon TV, broadcasting their exploits; coliseums where monsters are made to fight... These phenomena captivated people, and before long, adventurers had become an aspirational profession.

Utamaro Kitagawa, an unassuming high school student, decides to become an adventurer himself after witnessing a friend, who was supposed to be just as unremarkable, suddenly shoot to the top of the class hierarchy the moment he became an adventurer.

To obtain a rare card he could boast about to everyone, Utamaro stakes his life on an insane gacha that costs one million yen per pull—but what will be the outcome?

※Also published on Kakuyomu (currently exclusive to Kakuyomu).